多視全極化合成孔徑雷達(dá)圖象的統(tǒng)計(jì)分析
STATISTICAL ANALYSIS OF MULTI-LOOK POLARIMETRIC SAR IMAGERY
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摘要: 本文基于乘性相干斑模型,推導(dǎo)出多視全極化合成孔徑雷達(dá)(SAR)數(shù)據(jù)的無條件分布模型廣義的K分布,將從中演繹出的單通道多視強(qiáng)度K分布與幾種典型地表的實(shí)測數(shù)據(jù)的統(tǒng)計(jì)直方圖和幾種常用的分布模型進(jìn)行比較,經(jīng)驗(yàn)地建立了場景紋理的非均勻性與合適的統(tǒng)計(jì)分布模型之間的關(guān)系。此外,應(yīng)用統(tǒng)計(jì)分析的結(jié)果,本文還提出了一個自適應(yīng)的地貌類型分類方法,使分類精度得到明顯提高,說明了統(tǒng)計(jì)分析的重要性。
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關(guān)鍵詞:
- 極化合成孔徑雷達(dá); 多視處理; 相干斑; 統(tǒng)計(jì)分析; 分類
Abstract: With a multiplicative speckle model, the unconditional density function of the mutli-look polarimetric synthetic aperture radar (SAR) data is derived, and the result is shown to be a generalized K-distribution. The multi-look intensity K-distribution is particularly compared with histograms of physical radar measurements of several typical terrain types and several empirical distributions. The relationship between the heterogeneity coefficient of the scene texture and the proper statistical distribution model is experimentally established. In addition, based on the results of the statistical analysis, an adaptive classification scheme is presented, and the improved classification shows the importance of the statistical analysis. -
Goodman J W. Some fundamental properties of speckle[J].J. of Optical Society of America.1976, 66(11):1145-1148[2]Lim H, Swartz A A, et al. Classification of earth terrain using polarimetric SAR images[J].J. of Geophysical Research.1989, 94(136):7049-7057[3]Goodman N R. Statistical analysis based on a certain multivariate complex Gaussian distribution (An introduction)[J].Annals of Mathematical Statistics.1963, 34(l):152-177[4]Ulaby F T, Elachi C. (Ed.) Radar Polarimetry for Geoscience Application, MA: Artech House INC, 1990, Ch.2.[5]Lee J S. Speckle analysis and smoothing of synthetic aperture radar[J].Computer Graphics and Image Processing.1981, 17(l):24-32[6]Novak L M, Schtin M B, Cardullo M J. Studies of target detection algorithms that use polarimetric radar data. IEEE Tans. on AES, 1989, AES-25(2): 150-165.[7]Liu Guoqing, Huang Shunji, Torre A, Rubertone F. Optimal Speckle Reduction in Multi-look Polarimetric SAR Imagery. Proc. IGARSS95, Firenza, Italy: July 1995, 664-666.[8]Ulaby F T, Dobson M C. Handbook of Radar Scattering Statistics for Terrain, MA: Artech House INC, 1989, Ch. 3.[9]劉國慶.極化合成孔徑雷達(dá)成像的理論分析及應(yīng)用研究:[博士論文].成都:電子科技大學(xué),1996. -
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